Sony CDX-L280 - Block Diagram -Tuner Section

1616
CDX-L280
CNJ601
(ANTENNA)
2 16
1
FM_ANT L-CH
17
R-CH
CDL
24
DET_OUT
11
FM/AM_OSC
14
AM_VT
6
FM_VT
20
IF_CONT
19
OSC-IN
21
12
9
S_METER
TU+B
22
SD/ST_IND
FM_VCC
AM_VCC
PLL VCC
AM_ANT
TUNER UNIT
TU601
11
12
13
2
1
36
17
21
18
14
5
SYSTEM CONTROL
IC801 (2/3)
PLL
IC601
ELECTRONIC VOLUME
IC401
LF OUT
4
33
34
LR OUT
RF OUT
R-CH
RR OUT
8
BEEP
ATT
53
7
P.ON
6
A_ATT
31
TEL ATT
59
ACC IN
L5
L1
L2
R2
CE
DI
CL
VOL_CLK
VOL_DO
VOL_CE
17
22
21
PLL_DI
PLL_DO
PLL_CLK
23
PLL_CE
LCL
DST_SEL
S_METER
FM POWER
CONTROL
Q605,606
SD_IND
AUDIO OUT REAR
CD
SECTION
A
MUTE
CONT
Q401,402
Q102
MUTE
R-CH
DELAY BATT
BATT
Q909
BATT
D402
Q101
MUTE
22
MUTE
4
STBY
16
AUX-IN
11
12
5
3
9
7
POWER AMP
IC101
1
9
2
10
CNP501
R-CH
PJ401
FL+
FL-
RL+
RL-
4
12
FR+
FR-
3
11
RR+
RR-
16
+B (BATT)
5
AMP REM
6
8
19
ANT REM
GND
R-CH
F901
10A
7
ACC
15
TEST
33
TEST
AMP_ON
ACC
CHECK
Q902
32
26
28
17
18
L
R
• Signal path
:FM
:AM
:CD
ANT REMOTE
CONTROL
Q911,917
BACK-UP CHECK
Q903,904,D906,907
TUNER+8V REG
Q912,913,D913
COM+8V REG
Q918,919,929,D923
U_COM+5 V REG
Q920,D930,D999
U_COM+5V
COM+8V
TU+B
R-CH
8
FM_VCO
15
AM_VCO
16
FM_CP
18
VT
19
AM_CP
20
OSC
2
SEEK
XO
XI
10
IFC
13
MONO
11 24
1
CE
3
CK
5
D_IN
4
D_OUT
6
X601
10.25MHz
4
3
AM_DX/LCL
FM_DX/LCL
52
TU_ON
46
BU_IN
15
FM_ON
14
AM_ON
49
AM POWER
CONTROL
Q603,604
• R-ch is omitted due to same as L-ch.
3-3. BLOCK DIAGRAM — TUNER SECTION —
(Page 15)